/* ==========================================================================
   EXCEL ZERO TO HERO — MODERN DESIGN SYSTEM & STYLESHEET
   Aesthetic: Data & Analytics, Professional Spreadsheet Emerald, Refined Dark/Light
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&family=Outfit:wght@500;600;700;800&display=swap');

:root {
  /* Brand Palette - Excel & Analytics */
  --brand-primary: #107c41;
  --brand-primary-hover: #0e6837;
  --brand-primary-light: #e8f5e9;
  --brand-accent: #22c55e;
  --brand-teal: #0d9488;
  --brand-blue: #2563eb;
  --brand-amber: #d97706;
  --brand-rose: #e11d48;
  --brand-purple: #7c3aed;

  /* Light Mode Defaults */
  --bg-app: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #ffffff;
  --bg-subtle: #f1f5f9;
  --bg-code: #0f172a;
  --text-code: #e2e8f0;

  --border-subtle: #f1f5f9;
  --border-default: #e2e8f0;
  --border-strong: #cbd5e1;

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-inverse: #ffffff;

  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.08), 0 2px 4px -2px rgb(0 0 0 / 0.05);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.04);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.05);
  --shadow-glow: 0 0 20px -3px rgba(16, 124, 65, 0.25);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-display: 'Outfit', var(--font-sans);
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, Monaco, monospace;

  --header-height: 64px;
  --sidebar-width: 290px;
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg-app: #080d1a;
  --bg-surface: #0f172a;
  --bg-surface-elevated: #1e293b;
  --bg-subtle: #172136;
  --bg-code: #030712;
  --text-code: #e2e8f0;

  --border-subtle: #1e293b;
  --border-default: #2a374e;
  --border-strong: #3b4d6d;

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-inverse: #0f172a;

  --brand-primary-light: rgba(16, 124, 65, 0.18);
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.35), 0 2px 4px -2px rgb(0 0 0 / 0.3);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.45), 0 4px 6px -4px rgb(0 0 0 / 0.35);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.5), 0 8px 10px -6px rgb(0 0 0 / 0.4);
  --shadow-glow: 0 0 25px -3px rgba(34, 197, 94, 0.2);
}

/* Base Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 1.5rem);
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-app);
  color: var(--text-primary);
  line-height: 1.65;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--brand-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--brand-accent);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
}

/* ==========================================================================
   HEADER & NAVBAR
   ========================================================================== */

.app-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-default);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  transition: background var(--transition-normal), border var(--transition-normal);
}

[data-theme="dark"] .app-header {
  background: rgba(15, 23, 42, 0.85);
}

.brand-container {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-primary);
}

.brand-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, #107c41 0%, #16a34a 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 800;
  font-size: 1.25rem;
  box-shadow: 0 2px 8px rgba(16, 124, 65, 0.35);
  flex-shrink: 0;
}

.brand-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-title small {
  font-size: 0.68rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.header-center {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.search-trigger-btn {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--bg-subtle);
  border: 1px solid var(--border-default);
  color: var(--text-muted);
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 0.875rem;
  transition: all var(--transition-fast);
  min-width: 220px;
}

.search-trigger-btn:hover {
  background: var(--bg-surface);
  border-color: var(--brand-primary);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}

.kbd-shortcut {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-left: auto;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.header-progress-pill {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--bg-subtle);
  border: 1px solid var(--border-default);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.progress-mini-bar {
  width: 50px;
  height: 6px;
  background: var(--border-strong);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-mini-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--brand-primary), var(--brand-accent));
  width: 0%;
  transition: width var(--transition-normal);
}

.theme-toggle-btn, .mobile-menu-btn, .icon-btn {
  background: transparent;
  border: 1px solid var(--border-default);
  color: var(--text-secondary);
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover, .mobile-menu-btn:hover, .icon-btn:hover {
  background: var(--bg-subtle);
  color: var(--text-primary);
  border-color: var(--border-strong);
}

.mobile-menu-btn {
  display: none;
}

/* ==========================================================================
   MAIN LAYOUT & SIDEBAR
   ========================================================================== */

.app-container {
  display: flex;
  flex: 1;
  max-width: 1600px;
  margin: 0 auto;
  width: 100%;
}

.app-sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  height: calc(100vh - var(--header-height));
  position: sticky;
  top: var(--header-height);
  overflow-y: auto;
  padding: 1.5rem 1rem;
  border-right: 1px solid var(--border-default);
  background: var(--bg-surface);
  transition: background var(--transition-normal), border var(--transition-normal);
}

.sidebar-section {
  margin-bottom: 1.5rem;
}

.sidebar-title {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  padding-left: 0.75rem;
}

.sidebar-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.sidebar-nav-link {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.sidebar-nav-link:hover {
  background: var(--bg-subtle);
  color: var(--text-primary);
}

.sidebar-nav-link.active {
  background: var(--brand-primary-light);
  color: var(--brand-primary);
  font-weight: 600;
}

[data-theme="dark"] .sidebar-nav-link.active {
  color: #4ade80;
}

.sidebar-nav-icon {
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.85;
}

.sidebar-badge {
  margin-left: auto;
  font-size: 0.72rem;
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-full);
  background: var(--bg-subtle);
  color: var(--text-muted);
  font-weight: 600;
}

/* Main Content Area */
.app-main {
  flex: 1;
  min-width: 0;
  padding: 2rem 2.5rem 4rem;
}

.content-wrapper {
  max-width: 920px;
  margin: 0 auto;
}

.content-wrapper.wide-layout {
  max-width: 1200px;
}

/* ==========================================================================
   BREADCRUMBS & META HEADER
   ========================================================================== */

.breadcrumb-nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.breadcrumb-nav a {
  color: var(--text-secondary);
}

.breadcrumb-nav a:hover {
  color: var(--brand-primary);
}

.breadcrumb-separator {
  color: var(--text-muted);
  opacity: 0.6;
}

.page-header-box {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-default);
}

.page-category-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  background: var(--brand-primary-light);
  color: var(--brand-primary);
  margin-bottom: 0.75rem;
}

[data-theme="dark"] .page-category-badge {
  color: #4ade80;
}

.page-title {
  font-family: var(--font-display);
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  line-height: 1.2;
  margin-bottom: 0.75rem;
}

.page-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 1.25rem;
}

.page-meta-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.meta-pill {
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
  background: var(--bg-subtle);
  border: 1px solid var(--border-default);
  font-weight: 500;
  color: var(--text-secondary);
}

.meta-pill.difficulty-beginner {
  border-color: rgba(34, 197, 94, 0.4);
  color: #16a34a;
}

.meta-pill.difficulty-intermediate {
  border-color: rgba(217, 119, 6, 0.4);
  color: #d97706;
}

.meta-pill.difficulty-advanced {
  border-color: rgba(225, 29, 72, 0.4);
  color: #e11d48;
}

/* Action Bar (Mark Complete, Bookmark) */
.page-actions-toolbar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
  text-decoration: none;
}

.btn-primary {
  background: var(--brand-primary);
  color: #ffffff;
}

.btn-primary:hover {
  background: var(--brand-primary-hover);
  color: #ffffff;
  box-shadow: var(--shadow-glow);
}

.btn-secondary {
  background: var(--bg-surface);
  border-color: var(--border-default);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background: var(--bg-subtle);
  border-color: var(--border-strong);
}

.btn-sm {
  padding: 0.35rem 0.75rem;
  font-size: 0.8rem;
}

.btn.active-completed {
  background: #16a34a;
  color: #ffffff;
  border-color: #15803d;
}

.btn.active-bookmarked {
  background: #d97706;
  color: #ffffff;
  border-color: #b45309;
}

/* ==========================================================================
   DASHBOARD WIDGETS & CARDS
   ========================================================================== */

.dashboard-hero-card {
  background: linear-gradient(135deg, rgba(16, 124, 65, 0.08) 0%, rgba(34, 197, 94, 0.04) 100%), var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 2rem;
  position: relative;
  overflow: hidden;
}

.dashboard-hero-card::before {
  content: "";
  position: absolute;
  top: -50px;
  right: -50px;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(16, 124, 65, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.hero-content h1 {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.hero-content p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 1.25rem;
  max-width: 600px;
}

.hero-cta-group {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.progress-dial-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  flex-shrink: 0;
}

.circular-chart {
  display: block;
  margin: 0 auto;
  max-width: 110px;
  max-height: 110px;
}

.circle-bg {
  fill: none;
  stroke: var(--border-strong);
  stroke-width: 3.2;
}

.circle {
  fill: none;
  stroke-width: 3.2;
  stroke-linecap: round;
  stroke: var(--brand-primary);
  transition: stroke-dasharray 0.6s ease;
}

.percentage-text {
  fill: var(--text-primary);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.55rem;
  text-anchor: middle;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.metric-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  gap: 1rem;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.metric-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.metric-icon-box {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.icon-green { background: rgba(34, 197, 94, 0.12); color: #16a34a; }
.icon-blue { background: rgba(37, 99, 235, 0.12); color: #2563eb; }
.icon-amber { background: rgba(217, 119, 6, 0.12); color: #d97706; }
.icon-purple { background: rgba(124, 58, 237, 0.12); color: #7c3aed; }

.metric-info h3 {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.2rem;
}

.metric-value {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.1;
}

/* ==========================================================================
   CURRICULUM ROADMAP ACCORDION
   ========================================================================== */

.section-heading-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.section-heading-row h2 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
}

.module-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  margin-bottom: 1.25rem;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.module-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
}

.module-header {
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
  background: var(--bg-surface);
  gap: 1rem;
}

.module-header-main {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex: 1;
}

.module-num-badge {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--bg-subtle);
  border: 1px solid var(--border-default);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--brand-primary);
  flex-shrink: 0;
}

.module-header-titles h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.15rem;
}

.module-header-titles p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.module-header-stats {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.module-progress-chip {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.chevron-icon {
  font-size: 1rem;
  color: var(--text-muted);
  transition: transform var(--transition-normal);
}

.module-card.open .chevron-icon {
  transform: rotate(180deg);
}

.module-body {
  display: none;
  padding: 0 1.5rem 1.5rem;
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-app);
}

.module-card.open .module-body {
  display: block;
}

.module-objectives-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  margin: 1rem 0;
}

.module-objectives-box h4 {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

.module-objectives-box ul {
  padding-left: 1.25rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.lessons-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.lesson-item-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.lesson-item-row:hover {
  border-color: var(--brand-primary);
  transform: translateX(3px);
  color: var(--brand-primary);
}

.lesson-row-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.completion-check-icon {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 2px solid var(--border-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.65rem;
  color: transparent;
  transition: all var(--transition-fast);
}

.completion-check-icon.completed {
  border-color: #16a34a;
  background: #16a34a;
  color: #fff;
}

.lesson-title-text {
  font-size: 0.95rem;
  font-weight: 600;
}

.lesson-row-meta {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ==========================================================================
   PROSE & CONTENT STYLING
   ========================================================================== */

.prose {
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--text-primary);
}

.prose h1, .prose h2, .prose h3, .prose h4 {
  font-family: var(--font-display);
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.25;
  margin-top: 2rem;
  margin-bottom: 0.85rem;
}

.prose h1 { font-size: 2rem; }
.prose h2 { font-size: 1.5rem; border-bottom: 1px solid var(--border-default); padding-bottom: 0.5rem; }
.prose h3 { font-size: 1.25rem; }
.prose h4 { font-size: 1.05rem; }

.prose p {
  margin-bottom: 1.25rem;
}

.prose ul, .prose ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
}

.prose li {
  margin-bottom: 0.4rem;
}

.prose hr {
  border: 0;
  border-top: 1px solid var(--border-default);
  margin: 2.5rem 0;
}

.prose blockquote {
  border-left: 4px solid var(--brand-primary);
  background: var(--bg-subtle);
  padding: 0.85rem 1.25rem;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin-bottom: 1.25rem;
  color: var(--text-secondary);
}

/* Tables */
.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.92rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.prose th, .prose td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-default);
}

.prose th {
  background: var(--bg-subtle);
  font-weight: 700;
  color: var(--text-primary);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.prose tr:last-child td {
  border-bottom: none;
}

.prose tr:hover td {
  background: rgba(16, 124, 65, 0.03);
}

/* Code & Formulas */
.prose code:not(pre code) {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--bg-subtle);
  border: 1px solid var(--border-default);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  color: var(--brand-primary);
  word-break: break-word;
}

[data-theme="dark"] .prose code:not(pre code) {
  color: #4ade80;
}

.code-block-container {
  position: relative;
  margin: 1.5rem 0;
  background: var(--bg-code);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.code-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 1rem;
  background: rgba(255, 255, 255, 0.05);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.75rem;
  font-weight: 700;
  color: #94a3b8;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.code-copy-btn {
  background: rgba(255, 255, 255, 0.1);
  border: none;
  color: #e2e8f0;
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  font-size: 0.72rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.code-copy-btn:hover {
  background: var(--brand-primary);
  color: #ffffff;
}

.code-block-container pre {
  margin: 0;
  padding: 1.25rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--text-code);
}

/* Callouts */
.callout {
  margin: 1.5rem 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-default);
  background: var(--bg-surface);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.callout-header {
  padding: 0.75rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-weight: 700;
  font-size: 0.95rem;
  user-select: none;
}

details.callout summary.callout-header {
  cursor: pointer;
}

.callout-title {
  flex: 1;
}

.callout-body {
  padding: 0.75rem 1.25rem 1.25rem;
  font-size: 0.98rem;
  color: var(--text-secondary);
}

.callout-body p:last-child {
  margin-bottom: 0;
}

/* Callout Themes */
.callout-tip {
  border-left: 5px solid #16a34a;
}
.callout-tip .callout-header {
  background: rgba(22, 163, 74, 0.08);
  color: #16a34a;
}

.callout-warning, .callout-caution {
  border-left: 5px solid #d97706;
}
.callout-warning .callout-header, .callout-caution .callout-header {
  background: rgba(217, 119, 6, 0.08);
  color: #d97706;
}

.callout-danger {
  border-left: 5px solid #e11d48;
}
.callout-danger .callout-header {
  background: rgba(225, 29, 72, 0.08);
  color: #e11d48;
}

.callout-important, .callout-abstract, .callout-summary {
  border-left: 5px solid var(--brand-primary);
}
.callout-important .callout-header, .callout-abstract .callout-header, .callout-summary .callout-header {
  background: var(--brand-primary-light);
  color: var(--brand-primary);
}

.callout-question {
  border-left: 5px solid #7c3aed;
}
.callout-question .callout-header {
  background: rgba(124, 58, 237, 0.08);
  color: #7c3aed;
}

.callout-note, .callout-info {
  border-left: 5px solid #2563eb;
}
.callout-note .callout-header, .callout-info .callout-header {
  background: rgba(37, 99, 235, 0.08);
  color: #2563eb;
}

/* Internal links */
.internal-link {
  color: var(--brand-primary);
  font-weight: 500;
  text-decoration: underline;
  text-decoration-color: rgba(16, 124, 65, 0.4);
  text-underline-offset: 3px;
  transition: all var(--transition-fast);
}

.internal-link:hover {
  color: var(--brand-accent);
  text-decoration-color: var(--brand-accent);
}

/* ==========================================================================
   INTERACTIVE FLASHCARDS (3D FLIP)
   ========================================================================== */

.flashcard-deck-wrapper {
  max-width: 680px;
  margin: 2rem auto;
  perspective: 1200px;
}

.flashcard-status-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.flashcard-container {
  width: 100%;
  min-height: 360px;
  position: relative;
  cursor: pointer;
  transform-style: preserve-3d;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: var(--radius-xl);
}

.flashcard-container.is-flipped {
  transform: rotateY(180deg);
}

.flashcard-face {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: var(--radius-xl);
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border: 2px solid var(--border-default);
  background: var(--bg-surface);
  box-shadow: var(--shadow-lg);
}

.flashcard-face.flashcard-back {
  transform: rotateY(180deg);
  background: linear-gradient(135deg, var(--bg-surface) 0%, rgba(16, 124, 65, 0.05) 100%);
  border-color: var(--brand-primary);
}

.flashcard-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.flashcard-badge {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
}

.badge-front { background: var(--bg-subtle); color: var(--text-secondary); }
.badge-back { background: var(--brand-primary-light); color: var(--brand-primary); }

.flashcard-content {
  font-size: 1.35rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--text-primary);
  text-align: center;
  margin: auto 0;
}

.flashcard-footer {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.flashcard-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

.btn-know {
  background: #16a34a;
  color: #fff;
}
.btn-know:hover { background: #15803d; }

.btn-review {
  background: #e11d48;
  color: #fff;
}
.btn-review:hover { background: #be123c; }

/* ==========================================================================
   PRACTICE & QUIZZES
   ========================================================================== */

.quiz-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin: 1.5rem 0;
  box-shadow: var(--shadow-sm);
}

.quiz-question-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.quiz-options-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-bottom: 1.25rem;
}

.quiz-option-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  cursor: pointer;
  background: var(--bg-subtle);
  transition: all var(--transition-fast);
  user-select: none;
}

.quiz-option-item:hover {
  background: var(--bg-surface);
  border-color: var(--brand-primary);
}

.quiz-option-item.selected {
  border-color: var(--brand-primary);
  background: var(--brand-primary-light);
  font-weight: 600;
}

.quiz-option-item.correct {
  border-color: #16a34a;
  background: rgba(34, 197, 94, 0.15);
  color: #16a34a;
}

.quiz-option-item.incorrect {
  border-color: #e11d48;
  background: rgba(225, 29, 72, 0.12);
  color: #e11d48;
}

.quiz-feedback-box {
  display: none;
  padding: 1rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  margin-top: 1rem;
}

.quiz-feedback-box.show {
  display: block;
}

.feedback-correct {
  background: rgba(34, 197, 94, 0.1);
  border: 1px solid #16a34a;
  color: #15803d;
}

.feedback-incorrect {
  background: rgba(225, 29, 72, 0.1);
  border: 1px solid #e11d48;
  color: #be123c;
}

/* ==========================================================================
   GLOBAL SEARCH MODAL
   ========================================================================== */

.search-modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  z-index: 100;
  display: none;
  align-items: flex-start;
  justify-content: center;
  padding-top: 10vh;
}

.search-modal-backdrop.open {
  display: flex;
}

.search-modal-box {
  width: 100%;
  max-width: 650px;
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  max-height: 80vh;
  animation: modalSlideDown 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalSlideDown {
  from { opacity: 0; transform: translateY(-15px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.search-input-wrapper {
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  border-bottom: 1px solid var(--border-default);
}

.search-input-field {
  width: 100%;
  border: none;
  background: transparent;
  font-size: 1.15rem;
  color: var(--text-primary);
  outline: none;
}

.search-results-list {
  padding: 0.75rem;
  overflow-y: auto;
  max-height: 60vh;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.search-result-item {
  padding: 0.85rem 1rem;
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--text-primary);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  transition: background var(--transition-fast);
}

.search-result-item:hover, .search-result-item.selected {
  background: var(--bg-subtle);
}

.search-item-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.search-item-title {
  font-weight: 600;
  font-size: 1rem;
}

.search-item-badge {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
  background: var(--border-default);
  color: var(--text-secondary);
}

.search-item-snippet {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.search-empty-state {
  padding: 3rem 1.5rem;
  text-align: center;
  color: var(--text-muted);
}

.search-modal-footer {
  padding: 0.6rem 1.25rem;
  background: var(--bg-subtle);
  border-top: 1px solid var(--border-default);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ==========================================================================
   FOOTER & NAVIGATION
   ========================================================================== */

.page-pagination-footer {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 3.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-default);
}

.pagination-card {
  padding: 1.25rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  text-decoration: none;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  transition: all var(--transition-fast);
}

.pagination-card:hover {
  border-color: var(--brand-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.pagination-card.next {
  text-align: right;
  align-items: flex-end;
}

.pagination-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 700;
  color: var(--text-muted);
}

.pagination-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--brand-primary);
}

.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--border-default);
  background: var(--bg-surface);
  padding: 2.5rem 1.5rem;
  text-align: center;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.site-footer a {
  color: var(--text-secondary);
}

/* ==========================================================================
   RESPONSIVE DESIGN (TABLETS & MOBILE)
   ========================================================================== */

@media (max-width: 1024px) {
  .app-sidebar {
    position: fixed;
    left: -100%;
    top: var(--header-height);
    height: calc(100vh - var(--header-height));
    z-index: 40;
    transition: left var(--transition-normal);
    box-shadow: var(--shadow-xl);
  }

  .app-sidebar.mobile-open {
    left: 0;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .app-main {
    padding: 1.5rem 1.25rem 3rem;
  }

  .search-trigger-btn {
    min-width: unset;
  }
  .search-trigger-btn span {
    display: none;
  }
}

@media (max-width: 640px) {
  .dashboard-hero-card {
    flex-direction: column;
    align-items: flex-start;
    padding: 1.5rem;
  }

  .progress-dial-box {
    margin: 0 auto;
  }

  .page-pagination-footer {
    grid-template-columns: 1fr;
  }

  .page-title {
    font-size: 1.75rem;
  }
}

/* ==========================================================================
   VIDEO EMBED & CHAPTER SELECTOR
   ========================================================================== */

.video-section-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  margin-bottom: 2.5rem;
  box-shadow: var(--shadow-sm);
}

.video-responsive-wrapper {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%; /* 16:9 Aspect Ratio */
  height: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: #000;
  box-shadow: var(--shadow-md);
  margin-bottom: 1.25rem;
}

.video-responsive-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

.video-meta-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.video-chapter-selector {
  background: var(--bg-subtle);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: 1rem;
}

.video-chapter-selector h4 {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.chapter-buttons-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 0.5rem;
}

.chapter-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0.75rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  color: var(--text-primary);
  cursor: pointer;
  text-align: left;
  transition: all var(--transition-fast);
}

.chapter-btn:hover, .chapter-btn.active {
  border-color: var(--brand-primary);
  background: var(--brand-primary-light);
  color: var(--brand-primary);
}

.chapter-time-pill {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  background: var(--bg-subtle);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
}

/* ==========================================================================
   MIND MAP & VISUAL DIAGRAM VIEWER
   ========================================================================== */

.mindmap-container-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  margin-bottom: 2.5rem;
}

.mindmap-top-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--border-default);
  flex-wrap: wrap;
  gap: 0.75rem;
}

.mindmap-iframe-wrapper {
  width: 100%;
  height: 600px;
  background: #f8fafc;
  position: relative;
}

.mindmap-iframe-wrapper iframe {
  width: 100%;
  height: 100%;
  border: none;
}

.diagram-viewer-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow-sm);
}

.diagram-image-container {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-default);
  background: var(--bg-subtle);
  text-align: center;
  margin: 1rem 0;
}

.diagram-image-container img {
  width: 100%;
  height: auto;
  max-height: 700px;
  object-fit: contain;
  cursor: zoom-in;
  transition: transform 0.2s ease;
}

/* ==========================================================================
   DATASET CATALOG & HANDS-ON LABS
   ========================================================================== */

.dataset-catalog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.dataset-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.dataset-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-strong);
}

.dataset-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
}

.dataset-domain-badge {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-full);
}

.domain-retail { background: rgba(37, 99, 235, 0.12); color: #2563eb; }
.domain-hospitality { background: rgba(217, 119, 6, 0.12); color: #d97706; }
.domain-telecom { background: rgba(16, 124, 65, 0.12); color: #16a34a; }
.domain-practice { background: rgba(124, 58, 237, 0.12); color: #7c3aed; }

.dataset-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.25;
}

.dataset-stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
  background: var(--bg-subtle);
  border-radius: var(--radius-md);
  padding: 0.65rem 0.75rem;
  text-align: center;
}

.dataset-stat-item small {
  display: block;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
}

.dataset-stat-item strong {
  font-size: 0.95rem;
  color: var(--text-primary);
  font-family: var(--font-display);
}

.dataset-actions {
  display: flex;
  gap: 0.5rem;
  margin-top: auto;
  flex-wrap: wrap;
}

/* ==========================================================================
   SMART RESOURCE RELATIONSHIPS (LESSON PAGES)
   ========================================================================== */

.smart-relationships-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-top: 3rem;
  box-shadow: var(--shadow-sm);
}

.smart-relationships-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-primary);
}

.relationships-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.relationship-card {
  background: var(--bg-subtle);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  transition: all var(--transition-fast);
}

.relationship-card:hover {
  border-color: var(--brand-primary);
  background: var(--bg-surface);
  transform: translateY(-2px);
}

.relationship-type {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--brand-primary);
  letter-spacing: 0.05em;
}

.relationship-name {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* ==========================================================================
   STUDY PLANNER & MODULE BREAKDOWN WIDGET
   ========================================================================== */

.study-planner-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow-sm);
}

.planner-pace-options {
  display: flex;
  gap: 0.5rem;
  margin: 1rem 0;
  flex-wrap: wrap;
}

.pace-option-btn {
  flex: 1;
  min-width: 100px;
  padding: 0.6rem 0.8rem;
  background: var(--bg-subtle);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  font-size: 0.82rem;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.pace-option-btn.active {
  border-color: var(--brand-primary);
  background: var(--brand-primary-light);
  color: var(--brand-primary);
  font-weight: 700;
}

.module-progress-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-top: 1rem;
}

.module-progress-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
}

.module-progress-bar-wrap {
  width: 100px;
  height: 6px;
  background: var(--border-strong);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-left: 0.75rem;
}

.module-progress-bar-fill {
  height: 100%;
  background: var(--brand-primary);
  width: 0%;
  transition: width 0.4s ease;
}

/* ==========================================================================
   OBSIDIAN PUBLISHING & SOURCE CONTROLS
   ========================================================================== */

.obsidian-source-bar {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.6rem;
  margin-bottom: 1.5rem;
  font-size: 0.8rem;
}

.obsidian-source-bar a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--text-muted);
  text-decoration: none;
  padding: 0.25rem 0.55rem;
  border-radius: var(--radius-sm);
  background: var(--bg-subtle);
  border: 1px solid var(--border-default);
  transition: all var(--transition-fast);
}

.obsidian-source-bar a:hover {
  color: var(--text-primary);
  border-color: var(--border-strong);
}

/* ==========================================================================
   MERMAID DIAGRAM RENDERING & INTERACTIVE VIEWER
   ========================================================================== */

.mermaid-block-container {
  margin: 1.75rem 0;
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.mermaid-block-container:hover {
  border-color: var(--brand-primary);
  box-shadow: var(--shadow-md);
}

.mermaid-diagram-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 1rem;
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--border-default);
}

.mermaid-diagram-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--brand-primary);
  background: var(--brand-primary-light);
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
  letter-spacing: 0.05em;
}

.mermaid-diagram-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.mermaid-action-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.3rem 0.65rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.mermaid-action-btn:hover {
  color: var(--text-primary);
  border-color: var(--brand-primary);
  background: var(--bg-subtle);
}

.mermaid-viewport {
  padding: 2.25rem 1.5rem;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow-x: auto;
  min-height: 140px;
  background-color: var(--bg-surface);
  background-image: radial-gradient(var(--border-subtle) 1px, transparent 1px);
  background-size: 20px 20px;
  position: relative;
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.mermaid-viewport svg {
  max-width: 100%;
  height: auto !important;
  display: block;
  margin: 0 auto;
  filter: drop-shadow(0 4px 14px rgba(0, 0, 0, 0.06));
  font-family: 'Outfit', 'Inter', system-ui, -apple-system, sans-serif !important;
  transition: transform 0.2s ease;
}

/* Modern Roadmap Node Cards & Pill Badges */
.mermaid-viewport svg .node rect,
.mermaid-viewport svg .node polygon {
  rx: 10px !important;
  ry: 10px !important;
  stroke-width: 1.75px !important;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1) !important;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.04));
}

.mermaid-viewport svg .node circle {
  stroke-width: 2px !important;
  filter: drop-shadow(0 2px 6px rgba(0, 0, 0, 0.06));
}

.mermaid-viewport svg .node:hover rect,
.mermaid-viewport svg .node:hover polygon,
.mermaid-viewport svg .node:hover circle {
  filter: drop-shadow(0 6px 18px rgba(16, 124, 65, 0.25)) !important;
  cursor: pointer;
}

/* Modern Roadmap Subgraphs / Milestone Clusters */
.mermaid-viewport svg .cluster rect {
  rx: 16px !important;
  ry: 16px !important;
  stroke-width: 1.5px !important;
  stroke-dasharray: 6 4 !important;
  fill-opacity: 0.35 !important;
}

.mermaid-viewport svg .cluster span.nodeLabel,
.mermaid-viewport svg .cluster .cluster-label {
  font-weight: 800 !important;
  text-transform: uppercase !important;
  letter-spacing: 0.08em !important;
  font-size: 0.76rem !important;
}

/* Roadmap Curved Connectors & Paths */
.mermaid-viewport svg .flowchart-link,
.mermaid-viewport svg path.edge,
.mermaid-viewport svg path.link {
  stroke-width: 2px !important;
  stroke-linecap: round !important;
  stroke-linejoin: round !important;
  transition: stroke 0.2s ease, stroke-width 0.2s ease !important;
}

.mermaid-viewport svg .flowchart-link:hover,
.mermaid-viewport svg path.edge:hover {
  stroke-width: 3px !important;
  stroke: var(--brand-primary) !important;
}

/* Arrowheads & Markers */
.mermaid-viewport svg .marker {
  fill: currentColor !important;
  stroke: none !important;
}

/* Modern Pill Edge Labels (Milestone conditions along path) */
.mermaid-viewport svg .edgeLabel {
  background-color: var(--bg-surface) !important;
  color: var(--text-secondary) !important;
  padding: 3px 10px !important;
  border-radius: 9999px !important;
  border: 1px solid var(--border-default) !important;
  font-size: 0.74rem !important;
  font-weight: 600 !important;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06) !important;
}

.mermaid-viewport svg .edgeLabel p,
.mermaid-viewport svg .edgeLabel span {
  background: transparent !important;
  margin: 0 !important;
  padding: 0 !important;
}

/* Mindmap Modern Architecture */
.mermaid-viewport svg .mindmap-node rect,
.mermaid-viewport svg .mindmap-node circle {
  rx: 12px !important;
  ry: 12px !important;
  stroke-width: 2px !important;
}

.mermaid-viewport svg .mindmap-node text {
  font-weight: 600 !important;
}

.mermaid-loading-indicator {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-style: italic;
}

.mermaid-source-details {
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-subtle);
}

.mermaid-source-summary {
  padding: 0.5rem 1rem;
  font-size: 0.78rem;
  color: var(--text-muted);
  cursor: pointer;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  user-select: none;
}

.mermaid-source-summary:hover {
  color: var(--text-primary);
}

.mermaid-source-pre {
  margin: 0;
  padding: 0.85rem 1rem;
  font-size: 0.8rem;
  background: var(--bg-elevated);
  overflow-x: auto;
  border-top: 1px solid var(--border-subtle);
}

.mermaid-error-fallback {
  padding: 1rem;
  border-radius: var(--radius-md);
  background: rgba(239, 68, 68, 0.08);
  border: 1px solid rgba(239, 68, 68, 0.25);
  width: 100%;
}

.mermaid-error-header {
  font-size: 0.85rem;
  font-weight: 600;
  color: #ef4444;
  margin-bottom: 0.5rem;
}

/* Mermaid Modal Fullscreen View */
.mermaid-modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(5px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.mermaid-modal-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  width: 92vw;
  max-width: 1300px;
  height: 85vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-xl);
  overflow: hidden;
}

.mermaid-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid var(--border-default);
  background: var(--bg-subtle);
}

.mermaid-modal-title {
  font-weight: 700;
  font-size: 0.95rem;
}

.mermaid-modal-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.mermaid-modal-viewport {
  flex: 1;
  overflow: auto;
  padding: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-surface);
}

.mermaid-modal-viewport svg {
  max-width: 100%;
  height: auto;
}

.mermaid-modal-footer {
  padding: 0.6rem 1.25rem;
  font-size: 0.78rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-subtle);
}